BACTERIAL INOCULATION 



223 



markedly shortening the course of treatment. Should 

 sensitized bacterins fulfil their promise, they will mark 

 the greatest advance thus far in the history of bacterin 

 therapy. 



Bacterins, like tuberculins, are best stored in a 

 dry, cool, dark place. As a matter of convenience they 

 are put up in hermetically sealed ampoules or small 



Fig. 21. — Various forms of containers for storage of bacterins. 



bottles or vials fitted vi^ith ground glass stoppers or 

 rubber caps (Fig, 21). The standardized strength 

 of the bacterin, that is, the number of bacteria per 

 cubic centimetre, also its date of preparation, should 

 be inscribed on the container. The preservative, phe- 

 nol, usually added to the diluting fluid, insures against 

 contamination or bacterial growth in the preparation. 

 It should be remembered that the bacterin may ap- 



